He was indefatigable in the prosecution of this part of his mission.

And his labor was not in vain.

For in less than three months after his reaching England he had rendered the Colonization Society as odious there as his "Thoughts" had made it in America.

The great body of the anti-slavery sentiment in Great Britain promptly condemned the spirit and object of the American Colonization Society.

Such leaders as Buxton and Cropper "termed its objects _diabolical_;" while Zachary Macaulay, father of the historian, did not doubt that "the unchristian prejudice of color (which alone has given birth to the Colonization Society, though varnished over with other more plausible pretences, and veiled under a profession of a Christian regard for the temporal and spiritual interests of the negro which is belied by the whole course of its reasonings and the spirit of its measures) is so detestable in itself that I think it ought not to be tolerated, but, on the contrary, ought to be denounced and opposed by all humane, and especially by all pious persons in this country." The protest against the Colonization Society "signed by Wilberforce and eleven of the most distinguished Abolitionists in Great Britain," including Buxton, Macaulay, Cropper, and Daniel O'Connell, showed how thoroughly Garrison had accomplished his mission.